Mewtwo, The Genetic Pokémon. Its DNA is almost the same as Mew’s. However, its size and disposition are vastly different. It was created by a scientist after years of horrific gene-splicing and DNA-engineering experiments. Even though the scientific power of humans created this Pokémon's body, they failed to endow Mewtwo with a compassionate heart.
The original and only pokemon that has been Uber since release, Mewtwo is a pokemon that has gone from a pokemon that can do anything, to a defined role as a stallbreaker or wallbreaker. These roles are further extended by Mewtwos megas which expand on the roles that Mewtwo has excelled at through the years. Overall Mewtwo is a very versatile pokemon that is hard to really see what it's going to making it hard to play around.
Pressure - Opponent uses 2 power points instead of 1 - A good ability overall, especially for more defensive pokemon. While Mewtwo isn't the most tanky anymore, Pressure is still pretty nice
All Out Attacker
While Mewtwo has a hard time separating itself from its megas due to them doing its jobs better, but can still do these jobs well. As an all out attacker, Mewtwo does a better job powerwise than its Y mega thanks to a Life Orb. Psystrike is the best general move due to its high power and ability to break through special walls. Ice Beam is strong coverage, OHKOking threats such as Mega Salamence and Rayquaza what can threaten with high power moves. Aura Sphere is a strong option to hit Darkrai and Arceus Dark. Last slot is open to either Thunderbolt for Kyogre while Thunder is stronger but most unreliable without a Kyogre or Shadow Ball for Lugia.
Z Crystals - Mewtwo can use Z Crystals unlike its mega forms, allowing it to bait in threats and pressure or KO them with the right Z Crystal, namely Fightinium Z with Aura Sphere for Arceus Dark.
Mewtwo, The Genetic Pokémon. Psychic power has augmented its muscles. It has a grip strength of one ton and can sprint a hundred meters in two seconds flat!
Expanding on Mewtwos stallbreaker set, Mega Mewtwo X is a powerful threat in Ubers because it has better matchups into some of the answers to Mewtwo such as Arceus Dark. However Mega Mewtwo X brings some new checks and counters to the table, namely Fairies and physical walls, struggling with threats like Primal Groudon. Overall Mega Mewtwo X brings a special flexibility option as it has different answers than normal Mewtwo and can just remove a pokemon is the opponent doesn't realize that it's Mewtwo X
Steadfast - Prevents flinching - An alright ability, not a lot of pokemon use moves that can cause flinching in Ubers and really Insomnia would have been better.
Low Kick is the primary STAB of the set and with how heavy most things are in Ubers, it hits really hard. Taunt is the next key move as it really is what makes Mega Mewtwo X excel. Ice Beam is a nice other move as even with Jolly it can still KO Rayquaza and Mega Salamence who are big threats but Zen Headbutt can be used as it hits really hard and pressures Mega Gengar. Stone Edge is the last option to nail Ho-Oh and Lugia but is open to be switched for Zen Headbutt.
Genesect - Able to create space for Mewtwo to get in with U-Turn and revenge threats with its Choice Scarf, Genesect is able to pick off threats that Mewtwo weakens. Iron Head can also be used to threaten Xerneas but can't catch Xerneas after Geomancy.
Countering Mega Mewtwo
Marshadow - Marshadow is a big threat to Mewtwo X as without using Zen Headbutt, Mega Mewtwo X can't touch it. Meanwhile Marshadow can just 2HKO Mewtwo with Shadow Sneak making it a solid answer. Arceus - Extremespeed Arceus is a problem for Mewtwo as it will do a lot of damage but has to be wary of Low Kick. Meanwhile Arceus Fairy can OHKO Mewtwo making it a better threat but more niche.
Mewtwo, The Genetic Pokémon. Despite its diminished size, its mental power has grown phenomenally. With a mere thought, it can smash a skyscraper to smithereens.
With its Y Mega Stone, Mega Mewtwo Y gains boosted stats on the special side, allowing Mewtwo to gain power close to the power of normal Mewtwo with a Life Orb but no recoil. This allows Mega Mewtwo Y to act as a decent stallbreaker as well as a strong wallbreaker.
Insomnia - Prevents Sleep - Amazing with Darkrai floating around, this is great as Mewtwo can sponge up Dark Void as well as other stray sleep moves.
Similar to the Life Orb attacker Mewtwo set, Psystrike is the best general move of the set, stopping Blissey from just walking Mewtwo. Ice Beam is good coverage for the plethora of Dragons in Ubers. Fire Blast is good for Steel threats such as Arceus Steel and Necrozma Dusk Main. Focus Blast is a strong option in the last slot for Dark and Steel threats such as Dialga and Tyranitar but Calm Mind is an option to boost up and become more threatening. Taunt is also an option to help break through defensive pokemon.
Other Options & Partners
Shadow Ball - A strong option to break through threats such as Lugia and Lunala as well as pressure other threats such as Aegislash, Mega Sableye, and Necrozma Dusk Main/Dawn Wing.
Countering Mega Mewtwo
Marshadow - Marshadow is a nightmare for Mewtwo due to Shadow Sneak with a boost from Technician. Mega Mewtwo Y's EVs prevent being OHKOed before mega evolving, key being before. This means that Marshadow can OHKO Mega Mewtwo Y after it evolves making it a big problem for the mega.
Locations in Games
Black 2/White 2:
Omega Ruby/Alpha Sapphire:
Ultra Sun/Ultra Moon:
Let's Go, Pikachu!/Let's Go, Eevee!:
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